小弟在一本書上看到這一句話,可否請哪位強者幫我分析一下裡面的句型結構？
以下若有括號的部分是小弟自己的想法 有錯還請指正
But (what the IPad is doing) is starting a new shift in the paradigm
of user interfaces, and (what it's going to be doing) is simplifying
computing for everyone so we don't have to deal with all these technicalities.
我想請問的地方是 為何需要寫成what it's going to be doing呢？
而不是寫what it's going to do
寫成to be doing是有什麼文意或文法上需要嗎